well said. >> jimmy says obama wants to have a substantive debate. is there a worry that he could get too deep into the issues? >> no, because of the timeframe. they're 15-minute segments. they'll go back and forth. it's not set up. they won't have the chance to go way into it deep. >> that's my worry, that you come out of this with no substance. i want substance. >> if i'm a candidate running for the presidency of the united states, what i really care about are the undecides, the people who have not yet made up their mind. those are the folks that are going to swing this election. so you've got to speak to those folks. for them, it's not just a matter of the substance. substance is very, very important. but it's also a matter of your style. how do you react under pressure? do you have a sense of humor? are you quick on your feet? >> so here's a substantive question. it goes to specifics. we always talk about are we going to hear about specifics during this debate. apparently yesterday, romney came out and floated this idea of itemized deductions, a